
ello
well for a start i'd try a "save-as" and overwrite the original - its something i've done before and its worked
then i'd mask the image that bleeds off the page - just as a "try"
i'd deffo be looking at using a .psd file asap though - saves all dcs2 crap happening and is pretty good as a workable format.
now i may be wrong here <and thats usual> but instead of enlarging it in idcs, i'd maybe do it in photoshop and re-import so it sits on the page at 100% size. i guess enlarging it in either isnt the way to go, but if ya dont have the image at a bigger size yer kinda stuffed.
just a few things to try

good luk